Kállay, or Kallay, is a surname. Notable persons with that name include:
- Kállay family, a Hungarian noble family
- Béni Kállay (1839–1903), Austro-Hungarian statesman
- Tibor Kállay (1881–1964), Hungarian politician
- Miklós Kállay (1887–1967), Hungarian politician
- Gyula Kállai (1910–1996), Hungarian Communist politician
- Gabor Kallai (1959–2021), Hungarian chess Grandmaster
- Norbert Kállai (born 1984), Hungarian football player
- Foday Kallay, Sierra Leonian rebel group leader